根据所给图片填上合适的单词。 【小题1】The workers use ________to make a house. 【小题2】There are many tall ________in the city. 【小题3】Where did you put the ________? I need some to light the candles. 【小题4】Plant more ________to make our city beautiful and clean. 【小题5】Thick ________is over there. There must be a fire.